Derivative Financial Instruments and Hedging - Summary of Notional Amounts and Fair Value (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Gross notional amount	$ 1,583,000,000	$ 1,184,800,000.0
Total	(1,300,000)	5,600,000
Other current assets
Derivative [Line Items]
Derivative asset fair value	4,700,000	5,600,000
Other current liabilities
Derivative [Line Items]
Liabilities at fair value	(6,000,000)	0
Designated
Derivative [Line Items]
Gross notional amount	787,000,000	805,100,000.0
Total	(6,000,000)	3,500,000
Designated | Other current assets
Derivative [Line Items]
Derivative asset fair value	0	3,500,000
Designated | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	(6,000,000)	0
Non-Designated
Derivative [Line Items]
Gross notional amount	796,000,000	379,700,000.0
Total	4,700,000	2,100,000
Non-Designated | Other current assets
Derivative [Line Items]
Derivative asset fair value	4,700,000	2,100,000
Non-Designated | Other current liabilities
Derivative [Line Items]
Liabilities at fair value	$ 0	$ 0